Here are a couple of scans from my fav mag, EGG, showcasing these trends.
SO - here is the simple part. Two of the most easily accessible and trendy plus stores in my experience are Torrid and Forever21. Here are a couple of items that I found online that match these trends!
|simple gingham button up - can be worn open, buttoned, tied|
|open pointelle hoodie is almost exactly like the one in the 4th EGG pic|
|sailor themed shirts are easier to find in more places|
|the high waist button ups don't always look flattering, so try to find a 2 or 3 button pant instead|
|sailor striped dresses or tops are super easy to mix with nautical accessories|
|another simple gingham top in red this time for more color pop|
Hope this helps! Also, since these trends don't seem to be as popular in the US, consider bringing these trends into your style with accessories - like a bag or scarf.